20556240764 has 12 divisors (see below), whose sum is σ = 35976119088. Its totient is φ = 10277349600.

The previous prime is 20556240671. The next prime is 20556240769. The reversal of 20556240764 is 46704265502.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556240769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130457 + ... + 241104.

It is an arithmetic number, because the mean of its divisors is an integer number (2998009924).

Almost surely, 2^20556240764 is an apocalyptic number.

It is an amenable number.

20556240764 is a deficient number, since it is larger than the sum of its proper divisors (15419878324).

20556240764 is a wasteful number, since it uses less digits than its factorization.

20556240764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385396 (or 385394 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20556240764 in words is "twenty billion, five hundred fifty-six million, two hundred forty thousand, seven hundred sixty-four".